And august f



(No Model.)

R. A. L. SNYDER 8v A. F. TINNE'RHOLM. ELECTRIC HEATER.

No. 599,916. Patented Sept. 28,1897.

FY'Q.1.

UNiTED ASTATES PATENT OFFICE.

RICHARD A. L. SNYDER, OF PITTSBURG, PENNSYLVANIA, AND AUGUST F. TINNERI-IOLM, OF DETROIT, MICHIGAN, ASSIGNORS TO THE AMERICAN ELECTRICAL HEATER COMPANY, OF DETROIT, MICHIGAN.

ELECTRIC HEATER.

SPECIFICATION forming part of Letters Patent No. 590,916, dated September 28, 189'?.

Application tiled December 22, 1896x Serial No. 616,652. (No model.)

To all whom t may concern: iron; Fig. 2, a plan view of same, and Fig. 3 Beit known that We,RICHARD A.L.SNY DER, a cross-section showing ou r invention applied residing at Pittsburg, in the county of Alleto a soldering-iron. gheny and State of Pennsylvania,andAUGUsT Referring to the drawings, a indicates iron 5 F. TINNERHOLM, residing at Detroit, in the cores, each preferably consisting of a single 55 county of 1Wayne and State of Michigan, citipiece of cast-iron; but the cores may be com Zens of the United States,v have invented cerposed of a number of pieces of iron and built tain new and useful Improvements in Electric up in any suitable manner. Heaters 5 and We do hereby declare the fol- The number and shape of the cores may 1o lowing to be a full, clear, and exact descripvary to suit the various styles of appliances 6o tion of the invention, such as will enable `0thto which our invention is adapted. ers skilled in the art to which it appertains to Immediately surrounding each core and in make and use the same. contact therewith are sheets or pieces b of Our invention relates to improvements in some suitable insulating material, as mica. electric heating apparatus, With which either d is one of a series of layers of resistance- 65 an alternating or a direct current of el-ectric- Wire. I ity is employed. o are copper strips or pieces placed between In electric heating apparatus of the charthe layers of resistance\\'ire d, but separated acter to Which our invention relates it is of from the resistance-Wire by the insulatingzo the greatest importance that the heat genersheet b. ,.70 ated should be quickly transmitted to that By this constructionw-namely, a series of part of the apparatus which it is the object layers of resistance-Wire, sheets of insulating r to heat and to keep as cool as possible those material, and heat-con ducting copper strips parts of the apparatus not intended to be built up around the coresin the mannerabove heated. IVe have found by experience that described-that is to say, immediately sur- 75 when aheating-coil consists of a considerable rounding the cores a we place a sheet of good number of layers of resistance-wire the midinsulating material b, as mica. On this We dle layers, or layers inside the coil, get very Wind the first layer of Wire d. Another sheet much hotter than the outside layers and the of insulatingmaterial b is then placed over the 3o layers nearest the core. This is caused by first layer d of the series. Then the good 8o accumulation of heat, as the heat is not conheat-conducting substance, as the copper ducted away from the Wire as fast as generstrips e, are introduced. On the top of the ated, and as a consequence themiddle or instrip owe add another insulatingsheet o, then ner layers often burn out, while the outer layanother layer cl of the resistance-wire, and so ers and layers nearest the core are very little, on until the desired amount of wire is Wound 8 5 if any, affected by the heat. on the core-We produce a very eflicient de- The object of our invention is to overcome vice. this and to provide means of conducting away' It Will be understood that our invention the heat from all parts of the coil as fast as may be employed with many different styles 40 generated, of heating` appliances, but we have thought 9o Having these objects in View, as Well as the it only necessary to show and describe in deproduction of a very simplied form of aptail its use in connection With a flat-iron and paratus, our invention consists of the feaa soldering-iron, and We now first refer to tures, combination of parts and their con- Figs. il and 2 of the drawings.

struction, all as more fully hereinafter de- The iron cores a, having the resistance-Wire 95 scribed, and particularly claimed. Wound thereon in the manner above de- Our invention is illustrated in the accomscribed, together with the heat-conducting panying drawings, in whichM strips e, rest and are held in the desired po nigure l is a cross-section showing our insition on aniron plate f, or, rather, directly on 5o vention employed in connection with a tlatthe copper-plated surface g of the plate f. roo

ings.

side portions l and top m., provided With a The purpose olf the copper-plated surface r/ of the plate f is to aid in conducting heat from the l1cating-coils to said .plate and to distributc the heat over the entire plate. The cores (i are fastened to the plate f by screws 7i or other suitable means. Care should bc taken to have the copper strips e make goed Contact with the part to be heated. 7c, is a sheet or mat of asbestos resting on that part of the copperplated surface g oi" the plate fnot covered by the cores or spools and their Wind- The flat-iron further consists of the handle n and an opening o to permit the resistanceWire to pass to the cores a. The top m on its inner surface is provided with a sheet of asbestos 7x5. By thus making the outer easing; composed of three parts-na1nely, the heating-platef, the side portions l, and the top onf-all separated by asbestos or other suitable poor heat-conducting` material, We are enabled to keep tlic upper part of the iron in uch cooler than if the casing was mad-e from a single piece of metal.

In Fig. 3 We have shown a crossseeiion of a soldering-iron having,` an outer casing,` p, made of any suitable shape and material. -r is the soldering-tip. s is a handle provided with a hollow shank 2f, through which the Wire d passes. The core a, the mica sheets ZJ, and the copper strips e are all in the same relati vc position as inthe gn res above described.

Having thus described our invention, what ive claim isl. l'n an electric heating apparatus, a meance-Wire arranged on the core; a metallic shell in metallic contact with said. plate, a layer of insulated resistance-wire arranged on the metallic shell.

3. In an electric beatings,` alil'iaraius, the combination of an outer casing, a heating`- coil arranged Within said casing; said casing,` composed of separate parts consisting` of the heating-plate, side portions and top; poor heat-conducting material separating the side portions 'from the heating-plate and poor heatconducting material separating` the side portions and said top, substantially as described.

In testimon)T whereof vvc allix our signatures in the presence ol two witnesses.

RICHARD A. ll. SNYDER.. AUGUST F. llNlllfjll'lOljll- Witnesses to the signature of Snyder:

J oHN M. Pnnscfo'r'r, Jr., W. G. DooLIrrLn.

lVitnesses tothe signature et' 'llinnerliolmz BENJ. 1I. SCRANroN, W M. M. Faisan. 

